Firefox Community Forum

Issue Summary: When disconnecting from a corporate Cisco AnyConnect VPN on macOS, Firefox completely loses its internet connection and throws network errors. Other browsers (Chrome, Safari, Edge) continue working perfectly on the home network. Standard troubleshooting steps—like clearing Firefox's DNS cache, changing proxy settings to "No Proxy", turning off DNS over HTTPS (DoH), and flushing system DNS—do not resolve the issue.

Root Cause: Cisco AnyConnect locks low-level socket configurations and routing rules within the active Firefox user profile (prefs.js). Even after the VPN is disconnected, Firefox remains bound to the dead corporate pipeline, a behavior that standard settings menus cannot override.

Proven Solution: The only way to clear the corrupt VPN socket locks is to completely reset the internal profile architecture:Open Firefox, type about:support into the address bar, and press Enter.Look at the top right of the page and click the "Refresh Firefox..." button. Accept the prompt. Firefox will close, securely back up your bookmarks/passwords, generate a fresh profile, and restart.Internet access will instantly return to normal. (Note: You will just need to reinstall your extensions afterward).

Further to the malware, it references Windows OS but has seized her Mac. I powered off. Rebooted. Within about 15 seconds of opening Firefox the malware pops up and freezes the Mac. By the third time I was able "force quit" Firefox and the other applications function properly. I beleive I deleted Firefox but probably didn't get it all out. I reinstalled firefox and upon booting up Firefox the malware is still activated. Can you please assist with a fix?

After a recent firefox download, I noticed that on my 3 Mac computers, all using firefox on facebook, that none of my searches are being remembered anymore. But on Chrome they are remembered.

Does anyone else have this problem and what can be done about it. Facebook is useless for me without being able to use the search feature properly.

-Martha

Hi, Lately I haven't been able to add a bookmark icon on my 4-row new tab page. There's still to empty spots I would like to fill but can't find the usual + button. Thanks for the help

Issue: When Firefox starts after a system reboot, it starts on the incorrect desktop. This seems to be off by one; that is, I have Firefox assigned to Desktop 3 (using the Dock icon's Options menu). Under normal operation, it starts on Desktop 3, but after a reboot, it seems to start on (more recently) Desktop 2 or (earlier) Desktop 4. Unsure about what causes it to prefer 2 vs. 4.

This seems to happen after I've shut down (quit Firefox normally, shut down without reopening windows on login, power goes off, power on, log in, then click on the Firefox icon in the Dock) or after a system update (which reopens windows on login for me after rebooting and installing the update). It does not seem to happen after a Firefox update or after quitting Firefox normally and then restarting it from the Dock icon right away.

Pretty irritating, as I have major applications assigned to specific desktops, and Firefox is the only one that seems to forget which desktop it should be on.

Details:

Firefox 150.0.3 (aarch64):

• Settings > General > Startup > Open previous windows and tabs > TRUE (checked)

macos 26.5 (25F71) Tahoe:

• Settings > Desktop and Dock > Mission Control:
• ---> Automatically rearrange Spaces based on most recent use: FALSE
• ---> ...switch to a Space with open windows for that application: TRUE
• ---> Group windows by application: TRUE
• ---> Displays have separate Spaces: TRUE
• Dock > Firefox application icon > [Right Click] > Options > Assign To > This Desktop (i.e., Desktop 3)
• Apple Menu > Shutdown > Reopen windows when logging in: FALSE

MacBook Air M4 2025 24 GB RAM:

• No external displays connected

I use Firefox as my Browser. I have read about and activated, I think, VPN. When I receive emails with Adobe Acrobat documents attached, I cannot print the documents! Guide me to how to print Adobe Acrobat documents received by email, please.

We had a power outage in our area. Afterwards when the power was back on I could no longer get CNBC.com to work properly. It kinda opens but nothing goes live nor do the videos play. If I switch to Chrome everything works, but I like Firefox! Lynn Nichols

I'm using Firefox Nightly, and I'm fully aware that preview features come with their fair share of bugs. Usually, it only prompts for a restart to update every 2-3 days, but today, I’ve had to restart 5 times. 5!!

The version numbers are as follows:

20260505081714 20260505214504 20260506085915 20260506210744 20260507021236

I'm just wondering if there’s something wrong with my browser. Should I perform a clean install?"

The vpn beta button on the top right hand corner is there for me but I try and turn it on and it says "Couln't connect to VPN. Try again in a few minutes". This continues to happen. I have already went throught the step to turn this feature on with the code that the article refers to and that it is on but it still won't turn on. How do I get this to work. I know it works because when I initionaly it was working but now it doesn't work.

I can access Chewy with Safari, but not with Firefox. So the problem is not with my Mac settings and the problem is not with Chewy, the problem is with Firefox. Please address and fix it.

seems that after Firefox 150.0.3 (20260511200624). I cant access locally deployed servers that are not secure. the Firefox forces https when hitting http://localhost. I've tried to disable the HTTPS setting altogether. Even in developer mode it still overwrites http to https.

Good evening,

I'm going to install the applicatioin because it hasn't been working for several monnths ( it doesn't work anymore ). For exemple , if I want to watch Netflix and the video starts playing , there's no picture, it just loops and the screen is black.

I've tried everything turning off the computer, closing Netflix, even Youtube . I'm at a loss.

Thank you